Fine Tuning My Sub.
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=33513
Printed Date: May 18, 2024 at 11:03 AM
Topic: Fine Tuning My Sub.
Posted By: razorbacx
Subject: Fine Tuning My Sub.
Date Posted: June 08, 2004 at 12:17 PM
I've got an Xtant Z104 10" sub sitting in a Q-Logic QLH-1.0010SE enclosure. Xtant recommends .75 cuft for a sealed enclosure, however, my box is 1.00 cuft. Can I adjust the overall cuft by adding fill to the box or am I stuck where I am at? I want my bass to hit harder rather than sounding a bit "BOOMY" like it currently does. I believe and please correct me if I am wrong, that by addressing the internal size of my box I can get my bass to hit harder and to be more directed. For those that need to know here are my specs: 1996 Honda Accord EX 4 dr, JBL GTO635's in the front doors, MB Quart DKC 169's in the rear deck and all ran off a US Acoustics 4050 (4x50 rms) amp. Coustic 161SE amp bridged (mono) running my sub. Pioneer Premeir DEH-P550MP Head Unit. As always, I appreciate your assistance. Kind Regards, Razorbacx
Replies:
Posted By: DYohn
Date Posted: June 08, 2004 at 12:24 PM
Adding poly fill will make the enclosure function as if it was larger, not smaller. If yu want to cut down the effective internal volume of the enclosure, add something solid like a wooden block or MDF cubes or even bricks, glued or screwed to the inside walls. Add enough to take up 1/4 the available space to cut it down from 1 cuft to 0.75. And yes, you are correct that a smaller enclosure will add punch to the bass and remove boom, and also enable yur speaker to handel more amplifier power. ------------- Support the12volt.com
Posted By: razorbacx
Date Posted: June 08, 2004 at 12:56 PM
DYohn, Thanks for the assist! Razorbacx
Posted By: pureRF
Date Posted: June 08, 2004 at 2:12 PM
Build your own box out of 3/4 MDF with braceing. You will be abel to tell the biggest diff.
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dream it, build it, fiberglass it
Posted By: customsuburb
Date Posted: June 08, 2004 at 3:17 PM
pureRF wrote:
Build your own box out of 3/4 MDF with braceing. You will be abel to tell the biggest diff.
Yes, exactly. Most Q Logic boxes are made out of 5/8" (yuck ) mdf instead of 3/4."
Posted By: djMINIoompa
Date Posted: June 08, 2004 at 5:45 PM
customsuburb wrote:
pureRF wrote:
Build your own box out of 3/4 MDF with braceing. You will be abel to tell the biggest diff.
Yes, exactly. Most Q Logic boxes are made out of 5/8" (yuck) mdf instead of 3/4."
Yes. i agree 100%. Q-logic make cheap boxes and if you want your sub to hit nice, just build your own box the the exact specs that you need. You could put blocks in the box, that would do the job, but just build a box and do it rite. It will make a big difference.
Posted By: chasesaccessori
Date Posted: June 08, 2004 at 6:04 PM
Razor,
Another way to make this box work without building a new box is to add a coating to the inside of the box. (I have done this before to make a customer happy and it really works)
first I would add a set of 2x2's screwed to the inside of the box to take up the cu airspace needed. then...
Go to your automotive parts place and buy a can or two of some spray on bed liner. I am able to get some at my local wal-m***. In an area and while wearing cloths you don't mind getting messy, spray the insides of the enclosure in several layers with the liner. If you take your time you can build up a ¼ layer on all walls of the box. I do this liner method with even my new boxes just to add that extra vibration control to the box and makes the box about 1" thick.(I spray the ¾ MDF while still in sheet form for good even layers and remove the liner material from the butt or lap joint area so the glue bonds good)
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(owner/installer)
Chase's Accessories
Ridgecrest, CA
in business since 92
Posted By: sandt38
Date Posted: June 09, 2004 at 6:23 PM
2 thoughts really, and maybe a suggestion at the end ;)
The enclosure is weak, you need to strengthen it. Brace it some. While I would prefer a differant enclosure, this will work.
Second, decreasing enclosure size will decrease sound quality, and increase the boomyness of the sub.
Try to take the gains down some. Maybe you are simply overpowering your front stage, and the bump at resonance of the vehicle is just too overpowering.
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Posted By: DYohn
Date Posted: June 10, 2004 at 8:16 AM
[QUOTE=sandt38]2 thoughts really, and maybe a suggestion at the end ;)
Second, decreasing enclosure size will decrease sound quality, and increase the boomyness of the sub.
QUOTE] Uh, no. Actually that is backwards. Larger sealed enclosure will create a more boomy sound. ------------- Support the12volt.com
Posted By: Steven Kephart
Date Posted: June 10, 2004 at 11:46 AM
DYohn] wrote:
p>[QUOTE=sandt38]2 thoughts really, and maybe a suggestion at the end ;)
Second, decreasing enclosure size will decrease sound quality, and increase the boomyness of the sub.
QUOTE] Uh, no. Actually that is backwards. Larger sealed enclosure will create a more boomy sound.
I think what he is talking about is that when your enclosure get's smaller, Qtc. increases. I had a great quote by my boss on this topic and was trying to find it, but couldn't. The boomy sound you are talking about is from lessening higher frequency peaks, and increasing the lower extention. That can make it sound a little more boomy. Steven Kephart Adire Audio -------------
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